Помогите х+(х+42)=180

Question

Помогите х+(х+42)=180

Answer 1

2х+42=180
2х=180-42
2х=138
х-138:2
х=69

Answer 2

х+(х+42)=180
2х+42=180
2х=180 -42 =138
x =138/2 = 69